Probably the most often misunderstood element of KDE4 is Plasma, the extensive widget engine that replaces the normal desktop and the Kicker panel from KDE 3.x. The entire KDE4 desktop is built up out of Plasmoids (yet another term for desk accessory), including the panel and the desktop itself - and it is the latter that has been causing quite some confusion. Where are my desktop icons? Update: Aaron Seigo has published a screencast showing how the FolderView Plasmoid behaves as a normal desktop, and how to make it so.

Writing off potential "customers" whom are interested in your project and have questions, concerns and/or suggestions as "poisonous people" is not a good strategy in my book. On the whole 5 vocal critics will give you far more useful (if perhaps a bit loud) feedback than 50 fawning fanboys